164556638 has 8 divisors (see below), whose sum is σ = 246896832. Its totient is φ = 82257696.

The previous prime is 164556619. The next prime is 164556659. The reversal of 164556638 is 836655461.

164556638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3206 + ... + 18422.

It is an arithmetic number, because the mean of its divisors is an integer number (30862104).

Almost surely, 2^164556638 is an apocalyptic number.

164556638 is a deficient number, since it is larger than the sum of its proper divisors (82340194).

164556638 is a wasteful number, since it uses less digits than its factorization.

164556638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20626.

The product of its digits is 518400, while the sum is 44.

The square root of 164556638 is about 12827.9631274805. The cubic root of 164556638 is about 547.9889509733.

The spelling of 164556638 in words is "one hundred sixty-four million, five hundred fifty-six thousand, six hundred thirty-eight".